[turbofan] Regalloc: only pre-spill live ranges with spill operand.

src/compiler/register-allocator.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
@@ skipping 2374 matching lines @@
   return ret;
 }
 
 
 void RegisterAllocator::SplitAndSpillRangesDefinedByMemoryOperand(
     bool operands_only) {
   size_t initial_range_count = data()->live_ranges().size();
   for (size_t i = 0; i < initial_range_count; ++i) {
     TopLevelLiveRange* range = data()->live_ranges()[i];
     if (!CanProcessRange(range)) continue;
-    if (range->HasNoSpillType() || (operands_only && range->HasSpillRange())) {
-      continue;
-    }
+    if (!range->HasSpillOperand()) continue;
 
     LifetimePosition start = range->Start();
     TRACE("Live range %d:%d is defined by a spill operand.\n",
           range->TopLevel()->vreg(), range->relative_id());
     LifetimePosition next_pos = start;
     if (next_pos.IsGapPosition()) {
       next_pos = next_pos.NextStart();
     }
     UsePosition* pos = range->NextUsePositionRegisterIsBeneficial(next_pos);
     // If the range already has a spill operand and it doesn't need a
@@ skipping 1215 matching lines @@
         }
       }
     }
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8